Reagent rack storage unit



FIG. 1 is a perspective view of the reagent rack storage unit showing our new and ornamental design

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof; and,

FIG. 4 is a top view thereof.

The portions of the rack storage unit shown in broken lines in the figures form no part of the claimed design. 

CLAIM The ornamental design for a reagent rack storage unit, as shown and described. 